Add 1-1/2 cups cold milk to 1 pkg. (4-serving size) Jell-O
Vanilla Instant Pudding in medium bowl. Beat with wire whisk until well blended. Refrigerate 5 min. Gently stir in 1 cup thawed Cool Whip
Whipped Topping. Tint with a few drops of green food colouring, if desired. Spread evenly onto tops of cupcakes.